SECTION 09410

PORTLAND CEMENT TERRAZZO

PART	GENERAL

SECTION INCLUDES

Terrazzo floor [, border,] and base.

[Curb and border.]

[Stairs and landings.]

Divider strips [and termination edging].

PRODUCTS FURNISHED BUT NOT INSTALLED UNDER THIS SECTION

[Section [______-____________]: Installation of [termination edging.] [________.]

PRODUCTS INSTALLED BUT NOT FURNISHED UNDER THIS SECTION

[Section [______-____________]: Perimeter edging.]

Section [______-____________]: Recessed floor mat frames.

Section [______-____________]: Building [control] [and] [expansion] joint devices.

Section [______-____________]: Recessed [plumbing] [________] access cover frames.

Section [______-____________]: Floor drains.

Section [______-____________]: Recessed [electrical access cover frames.] [floor outlets.]

RELATED SECTIONS

Section [______-____________]: Concrete subfloor with [broom] [________] finish.

Section [______-____________]: Formed steel stair pans.

Section [______-____________]: Wood subfloor.

Section 07900 - Joint Sealers: Joint between terrazzo base and wall surface.

Section 09440 - Plastic Matrix Terrazzo.

Section 09726 - Seamless Aggregate Flooring.

Section [______-____________]: Precast terrazzo [tile.] [________.]

REFERENCES

ASTM A185 - Welded Steel Wire Fabric for Concrete Reinforcement.

ASTM C33 - Concrete Aggregates.

ASTM C150 - Portland Cement.

ASTM C309 - Liquid Membrane-Forming Compounds for Curing Concrete.

ASTM D2103 - Polyethylene Film and Sheeting.

NTMA (National Terrazzo and Mosaic Association, Inc.) - Terrazzo Ideas and Design Guide.

SUBMITTALS

Submit under provisions of Section [01300.] [________.]

Shop Drawings: Indicate divider strip, [control joint,] [and] [expansion joint] layout, details of adjacent components [and] [________].

Product Data: Provide data for [divider strips,] [control joint strips,] [expansion joints,] [sealer,] [and] [________].

Samples: Submit [two] [_______] samples, [6 x 6] [____x____] inch ([150 x 150] [____x____] mm) in size illustrating color, chip size and variation, chip gradation, mortar color, [and ground top surface of divider strip.]

MAINTENANCE DATA

Submit under provisions of Section [01700.] [________.]

Maintenance Data: Include procedures for stain removal, stripping, and sealing.

QUALITY ASSURANCE

Perform Work in accordance with [NTMA.] [________.]

Maintain [one copy] [[____] copies] of [each] document on site.

QUALIFICATIONS

Installer: Company specializing in performing the work of this section [with minimum [three] [____] years [documented] experience.] [approved by manufacturer.]

MOCKUP

Provide mockup of floor, base, [border,] [and] [curb] under provisions of Section [01400.] [________.]

Construct mockup, [____] feet ([____] m) long by [____] feet ([____] m) wide of terrazzo flooring, and [3] [_____] lineal ft ([1] [_____] m) of base, [curb,] [and] [border].

Locate [where directed.] [________.]

Mockup may [not] remain as part of the Work.

ENVIRONMENTAL REQUIREMENTS

Do not install terrazzo when temperature is below [50] [____] degrees F ([10] [____] degrees C) or above [90] [____] degrees F ([32] [____] degrees C).

Maintain this temperature range 24 hours before, during, and [72] [____] hours after installation of terrazzo.

Provide lighting level of [80] [____] ft candles ([860] [____] lx) measured at floor surface.

COORDINATION

Coordinate work under provisions of Section [01039.] [________.]

Coordinate the work with mechanical and electrical access cover placement in relation to terrazzo divider strips.

PART	PRODUCTS

MATERIALS

Portland Cement: ASTM C150, Type 1 Normal; [white] [gray] color for topping mix; gray color for underbed; modified to NTMA higher compressive strength requirements; obtained from single source.

Color Pigments For Topping: Non-fading mineral type.

Terrazzo Sand: [ASTM C33.] [Sharp, coarse, clean, screened, and free of deleterious material.]

Cushion Sand: [ASTM C33.] [Clean and free of deleterious material.]

Water: Potable.

Surface Aggregate: Crushed [marble,] [granite,] [quartz,] No. [0 - 1] [1 - 2] [________] size in accordance with NTMA chip size for standard gradation and uniform coloration.

****** [OR] ******

Surface Aggregate: Type, color, and size to match existing.

****** [OR] ******

[Venetian] [Palladiana] Surface Aggregate: Crushed [marble,] [granite,] [quartz,] in accordance with NTMA chip size for [Venetian] [Palladiana] gradation and uniform coloration.

ACCESSORIES

Reinforcing Mesh: ASTM A185; [2 x 2 inch x 18 gage] [[____x____] inch x [____] gage] ([51 x 51 x 1.4] [____x____x____] mm), galvanized.

Divider Strips: [____] inch ([____] mm) thick [zinc] [brass] [plastic] exposed top strip, zinc coated steel concealed bottom strip, [____] inch ([____] mm) deep, with anchoring features; [________] manufactured by [____________].

Control Joint Strips: [____] inch ([____] mm) nominal width [zinc] [brass] exposed top strip, zinc coated steel concealed bottom strip, [1/8] [1/4] [____] inch ([3] [6] [____] mm) wide neoprene filler strip between vertical strips, with anchoring features; [________] manufactured by [____________].

Strip Height: To suit thickness of terrazzo topping, with allowance for grinding.

Base Cap, Base Divider Strip, and Separator Strip: Match divider strips [with projecting base of [1/2] [____] inch ([13] [____] mm).]

Foam Filler: [Closed cell urethane foam] [________], capable of compression to 50 percent of its thickness with full recovery.

Slip Sheet: [ASTM D2103; [4] [6] [____] mil ([0.10] [0.15] [____] mm) polyethylene sheet.] [Asphalt treated and reinforced paper.] [________.]

Non-slip Inserts: [Zinc,] [Brass,] [3/8 x 3/8] [____x____] inches x [20] [____] gage ([9 x 9 x 0.9] [____x____x____] mm) dove-tail shaped channels, with anchors; filled with [aluminum oxide] [carborundum] [________] non-slip filler; [________] manufactured by [____________].

Curing Compound: [ASTM C309.] [________.]

Cleaner: Neutralizing liquid type, pH of [7 - 10] [____]; [________] manufactured by [____________].

Sealer: Colorless, penetrating liquid type to completely seal cementitious matrix surface; not detrimental to terrazzo components; [________] manufactured by [____________].

[Wood Subfloor Joint Tape: [Cloth] [________] type.]

[Subfloor Filler: [Latex] [__________] type.]

MIXES

Underbed: One part Portland cement to [4] [____] parts sand by volume. Add water to produce low slump mix.

Floor: NTMA Plate No. [____], [white] [gray] Portland cement, [with exposed divider and accessory strips].

Base and Border: NTMA Plate No. [____], [white] [gray] Portland cement, [with exposed divider and accessory strips].

Curb and Border: NTMA Plate No. [____], [white] [gray] Portland cement, [with exposed divider and accessory strips].

Stair Treads, Landings, and Stringers: NTMA Plate No. [____], [white] [gray] Portland cement, [with exposed divider and accessory strips].

PART	EXECUTION

EXAMINATION

Verify that substrate surfaces are ready to receive work.

Do not begin terrazzo work until concrete substrate has cured [28] [____] days, minimum.

PREPARATION

Clean substrate of foreign matter.

[Remove surface water and thoroughly brush in neat cement slurry bond coat.]

[Prepare wood subfloor, tape joints, and apply subfloor filler. Isolate terrazzo installation from wood subfloor with slip sheet, lap edges and ends.]

APPLICATION - MONOLITHIC TERRAZZO

[Saw cut underbed to] install divider [and control joint] strips.

Install strips straight and level [to locations indicated].

Install non-slip inserts in [floors] [and] [stair nosings] where indicated.

Install recessed [floor mat,] [floor access panel,] [and] [________] frames.

Slope strips to match floor surface slope to drains.

Install base [border,] [and curb] divider [and control joint] strips to match floor pattern.

Install terminating cap strip at top of base; attach securely to wall substrate.

Place terrazzo topping mix over slurry coated substrate to a nominal thickness of [1/2] [5/8] [1] [____] inch ([12] [16] [25] [____] mm).

****** [OR] ******

APPLICATION - BONDED TERRAZZO

Place cementitious underbed over wet slurry bond coat, to a nominal thickness of [1-1/4] [____] inches ([31] [____] mm). Broom finish top surface.

Divide underbed construction into panels of [400] [____] sq ft ([40] [____] sq m) separated with [1/2] [____] inch ([13] [____] mm) foam filler.

[Place strips into semi-plastic uncured underbed.]

Place divider [and control joints] [to locations indicated]. Install straight and level.

Slope strips to achieve floor surface slope to drains.

Install non-slip inserts in [floors] [and stair nosings] where indicated.

Install [mat] [access panel] [________] recess frames.

Install base [border,] [and curb] divider [and control joint] strips to match floor pattern.

[Install terminating cap strip at top of base; attach securely to wall substrate.]

Place terrazzo topping mix over prepared underbed to a nominal thickness of [5/8] [1] [____] inch ([16] [25] [____] mm).

****** [OR] ******

APPLICATION - SAND CUSHION TERRAZZO

Place sand cover over structural floor substrate to a nominal thickness of [1/8] [____] inch ([3] [____] mm), roll smooth.

Place slip sheet over sand bed surface, lap edges and ends [2] [6] [____] inches ([50] [150] [____] mm).

Place cementitious underbed over slip sheet to nominal thickness of [1-3/4] [____] inches ([44] [____] mm). Broom finish top surface.

Place reinforcement to [lower third] [mid-thickness] of underbed. Discontinue reinforcement at control joint and joint separations of underbed. Lap reinforcement joints [6] [____] inches ([150] [____] mm) minimum.

[Place strips into semi-plastic uncured underbed.]

Locate control joints to frequency required by 400 sq ft (40 sq m) maximum underbed panel size, and more frequently where structural sub-floor deflects easily.

Place divider [and control joints] [to locations indicated]. Install straight and level.

Slope strips to achieve floor surface slope to drains.

Install non-slip inserts in [floors] [and stair nosings] where indicated.

Install [mat] [access panel] [________] recess frames.

Install base [border,] [and curb] divider [and control] strips to match floor pattern.

[Install terminating cap strip to top of base; attach securely to wall substrate.]

Place terrazzo topping mix over prepared underbed to a nominal thickness of [5/8] [1] [____] inch ([16] [25] [____] mm).

APPLICATION - BASE [, BORDER] [AND CURBS]

Vertical Base Flush With Wall: [3/8] [____] inch ([9] [____] mm) minimum topping on underbed bonded to wall substrate, with cove transition between horizontal and vertical surfaces. Form base to total minimum thickness of [3/8] [____] inch ([9] [____] mm).

****** [OR] ******

Vertical Base Projecting From Wall: [3/8] [____] inch ([9] [____] mm) minimum topping on underbed bonded to wall substrate, projecting [1/4] [____] inch ([6] [____] mm) from finish wall surface, with cove transition between horizontal and vertical surfaces [; shape base as detailed].

Border: Form [____] inch ([____] mm) wide border with division strips, of terrazzo color dissimilar from [floor] [wall] [base] [curb]; measured from surface of finished wall.

Hospital Curb: Form to profile [as indicated] with [3/8] [____] inch ([9] [____] mm) topping minimum, on underbed; of terrazzo color dissimilar from [floor] [wall] [base].

APPLICATION - STAIRS

Terrazzo Stairs and Landings: Minimum [5/8] [____] inch ([16] [____] mm) topping on underbed bonded to treads and minimum [3/8] [____] inch ([9] [____] mm) topping on underbed bonded to risers. Total minimum thickness of [1-1/2] [____] inches ([38] [____] mm) for treads and [1] [____] inch ([25] [____] mm) for risers.

****** [OR] ******

Terrazzo Treads and Landings in Metal Pans: [5/8] [____] inch ([16] [____] mm) terrazzo topping on reinforced underbed. Total minimum thickness of [2] [____] inches ([50] [____] mm).

CURING

Cure terrazzo topping [7] [____] days by the [liquid membrane] [sheet polyethylene] [damp burlap] [________] curing method.

****** [OR] ******

Use curing method in accordance with NTMA instructions.

Close area to allow undisturbed curing.

SURFACE FINISHING

Brush apply terrazzo topping mix slurry to topping surface.

Finish terrazzo in accordance with NTMA instructions.

Produce terrazzo finish surface [to match approved [mockup] sample,] with minimum [70] [____] percent chip exposed.

Grind terrazzo surface with power disc machine; successively sequence using coarse to fine grit abrasive, using a wet method.

Apply grout mix to match matrix over ground surfaces to fill honeycomb exposed during grinding.

After grout has sufficiently cured, grind, using a fine grit abrasive.

[Hand grind base [, cove,] [and curb] similarly.]

TOLERANCES

Maximum Variation from Flat Surface: [1/8] [____] inch in 10 feet ([3] [____] mm in one m).

Maximum Variation from Level (Except Surfaces Sloping to Drain): [1/8] [____] inch ([3] [____] mm).

CLEANING

Scrub and clean terrazzo surfaces with cleaner in accordance with NTMA instructions. Let dry.

Immediately when dry, apply sealer in accordance with [NTMA] [manufacturer's] instructions. Let dry.

Seal and polish surfaces in accordance with [NTMA] [manufacturer's] instructions.

PROTECTION OF FINISHED WORK

Protect finished installation under provisions of Section [01500.] [________.]

Do not permit traffic over finished terrazzo surfaces.

SCHEDULE

Main Foyer 112: Venetian terrazzo, NTMA Plate No. V112, bonded application.

Shower Room 213: Standard terrazzo, NTMA Plate No. S101, bonded application.

Locker Room 214: Standard terrazzo, NTMA Plate No. S103, sand cushion underbed application over existing floor.

END OF SECTION